Automatic train brake mechanism



'0. BO E RNER AUTOMATIC TRAIN BRAKE MECHANISM Filed Nov. 30, 1926 12 Z? I? 23' v J! I 2 IN VEN TOR afloemer' ATTORNEY Patented Dec. 27, 1927.

UNITED STATES OTTO BOERNER, F HAMBURG, GERMANY;

AUTOMATIC TRAIN BRAKE MEGHAN ISM.

Application filed November 30, 1926. Serial No. 151,632.

thereby actuating a lever which operates the brake shoes by swinging the latter into contact with the rim of the wheel.

The above and other objects will become apparent in the description below in which characters of reference refer to like-named parts in the drawing.

Referring briefly to the drawing Figure 1 is a side elevational view of an application showing the brake mechanism as applied to a railway coach,

Figure 2 is a longitudinal sectional elevational view of the brake mechanism illustrating its application to a railway truck. Figure 3 is a top plan View of Figure 2. Referring in detail to the drawing the numeral indicates the "body of a railway coach of the conventional type. Said body is mobilely supported on a pair of trucks having wheels 11 rotatably mounted thereunder. Bracketarms 12 are mounted on the underside of the floor of the body and extend angularly outward above the wheels of the trucks. These arms support levers which are pivoted thereon intermediate. their length and have brake shoes secured to their lower ends. The levers are indicated by the numerals 13 and the shoes by the numerals Between the front and the rear trucks of the coach a cylinder 16 is mounted on the.

coach by pairs of straps 17. The cylinder has a piston head 18 slidably mounted there in which has secured thereto the piston rod extending outwardly for a distance and its end is journalled in the cross brace 20 which forms a triangular frame together with a pair of bars 21 and 22. A pair of brackets 23 extend horizontally from the cap 25 of the cylinder and are provided to pivotally I 7 with the sector 26 by a coil spring locked around the bar,- said coil spring being indicated by the numeral 28. At the upper end of the lever a grooved pulley 29 is rotatably mounted and has trained about it a flexible cable 30 whose ends are connected to the opposing brake levers 13 of a truck, as shown in dotted lines in Figure 2. The lower ends of the levers 2 1 have; pivotally connected thereto one of the ends of a pair of links whose opposite ends are secured pivotally to the piston rod 19 intermediate its length and is adapted to be rotated by the piston rod in one direction when the latter is extended.

The cylinder has a pair of pipes 82 and 33 communicating with it at opposite ends. These pipes are coupled to a hose line which extends to adistant position such as the cab of a locomotive or to an operating position of control.

The device is used to actuate the brake shoes by urging the latter into contact with the rim of the wheels 11. When a valve located at the operators position is opened thru the pipe 32 the piston rod 19 is extended and as the levers 2e are coupled to the piston rod thru the medium of the connecting links 31, said levers 2 1 are rotated on their pivotacross the sector 26 thereby pulling on the cable 30. This cable when pulled rotates the levers 13 in opposite direction in such manner that the lower end of said levers, to which the brake shoes are attached are moved toward the rim of the wheels causing the shoes to engage the wheels thereby abruptly slowing the momentum of the vehicle to which the device is attached.

It is to be noted that certain changes in form and construction may be made without departing from the spirit and scope of the invention.

When the lever 24: has been actuated by the extension of the piston rod the locking bar 27 will find itself at an intermediateposition on the sector 26 thereby securing the brake shoes in locked position until such time as the lever 24 is manually released.

I claim:

In a brake mechanism, a cylinder operated piston, a cylinder, brake shoes and levers urging said brake shoes into contact with Wheels, a bracket extending horizontally from said cylinder, an additional lever pivoted thereon, a sector on said bracket, a slid- 1 able locking rod on said additional lever engaging said sector, a link connecting said additional lever with the piston rod, a pulley at the upper end of said additional lever,

and a cable trained about said pulley and 15 connected to said brake shoe levers In testimony whereof I afiiX my slgnature.

OTTO BOERNER. 

